View Compilation Error

0_0_32848543_29441.cpp: In function 'int BFS(int, int, int, int)':
0_0_32848543_29441.cpp:37:28: error: too few arguments to function 'bool legal(int, int, int, int)'
             if(legal(tx, ty) && !dis[tx][ty] && G[tx][ty]!='#'){
                            ^
0_0_32848543_29441.cpp:20:6: note: declared here
 bool legal(int x, int y, int ax, int ay){
      ^